Preheat the oven to 200 degres celsius.
Wash and scrub the Jerusalem artichokes with a clean pot sponge. You don't have to peel them.
Cut the Jerusalem artichokes into boats and put them in an ovenproof dish along with oil, dried thyme, salt and pepper, mixing it all around well.
Bake the Jerusalem artichokes for about 30 minutes at 200 degrees celcius until tender and baked through.
Serve the hot Jerusalem artichokes sprinkled with fresh thyme on top immediately.